Migration to PHP5 (ongoing)

To move forward we need to forget about PHP4 and move on to PHP5. Here is what we should do:
1. rename all class constructors to "__construct"
2. determine what class variables and methods should be private/public/protected (also the way, how that methods/attributes are used by programmers should be taken into account). For example kDBItem::FieldValues is private, but is used as public attribute.
3. Look through out the classes to determine what immediate benefit could be gained by transforming class implementation php PHP5.